/********************************** (C) COPYRIGHT  *******************************
* File Name          : main.c
* Author             : WCH
* Version            : V1.0.0
* Date               : 2019/10/15
* Description        : Main program body.
*******************************************************************************/

/*
 *@Note
 使用CRC错误校验，Master/Slave 模式收发例程：
 Master：SPI1_SCK(PA5)、SPI1_MOSI(PA7)。
 Slave：SPI1_SCK(PA5)、SPI1_MISO(PA6)。
 
 本例程演示使用CRC错误校验，Master 发，Slave 收。
 注：两块板子分别下载 Master 和 Slave 程序，同时上电。
     硬件连线：PA5 —— PA5
	           PA7 —— PA6
 
*/
 
#include "debug.h"

/* SPI Mode Definition */
#define HOST_MODE   0
#define SLAVE_MODE   1

/* SPI Communication Mode Selection */
#define SPI_MODE   HOST_MODE
//#define SPI_MODE   SLAVE_MODE

/* Global define */
#define Size 4

/* Global Variable */ 
u8 TxData[Size] = { 0x01, 0x02, 0x03, 0x04};
u8 RxData[Size];

/*******************************************************************************
* Function Name  : SPI_1Lines_HalfDuplex_Init
* Description    : Configuring the SPI for half-duplex communication.
* Input          : None
* Return         : None
*******************************************************************************/ 
void SPI_1Lines_HalfDuplex_Init(void)
{
	GPIO_InitTypeDef GPIO_InitStructure;
	SPI_InitTypeDef SPI_InitStructure;
	
	RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_SPI1, ENABLE );	
	
#if (SPI_MODE == HOST_MODE)	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;	
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init( GPIOA, &GPIO_InitStructure );	
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;		
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init( GPIOA, &GPIO_InitStructure );
	
#elif (SPI_MODE == SLAVE_MODE)		
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;		
	GPIO_Init( GPIOA, &GPIO_InitStructure );	
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;		
	GPIO_Init( GPIOA, &GPIO_InitStructure );	
#endif


#if (SPI_MODE == HOST_MODE)		
	SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;	
	SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
	
#elif (SPI_MODE == SLAVE_MODE)		
	SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx;
	SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;	
	
#endif	
	
	SPI_InitStructure.SPI_DataSize = SPI_DataSize_16b;	
	SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
	SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;	
	SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;	
	SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;	
	SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;	
	SPI_InitStructure.SPI_CRCPolynomial = 7;
	SPI_Init( SPI1, &SPI_InitStructure );

	SPI_CalculateCRC( SPI1, ENABLE );		
	SPI_Cmd( SPI1, ENABLE );	
}

/*******************************************************************************
* Function Name  : main
* Description    : Main program.
* Input          : None
* Return         : None
*******************************************************************************/
int main(void)
{
	u8 i=0,crcval;
	
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);	
	Delay_Init();
	USART_Printf_Init(115200);
	printf("SystemClk:%d\r\n",SystemCoreClock);

#if (SPI_MODE == SLAVE_MODE)
	printf("SLAVE Mode\r\n");
	Delay_Ms(1000);

#endif	
	SPI_1Lines_HalfDuplex_Init();	
		
#if (SPI_MODE == HOST_MODE)
	printf("HOST Mode\r\n");	
	Delay_Ms(2000);	

#endif
	
	while(1)
	{
#if (SPI_MODE == HOST_MODE)		
		while( i<3 ) 
		{
			if( i<2 )
			{
				if( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_TXE ) != RESET )		
				{
					SPI_I2S_SendData( SPI1, TxData[i] );	
					i++;
				}
			}
      else
			{
				if( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_TXE ) != RESET )
				{
					SPI_I2S_SendData( SPI1, TxData[i] );	
					SPI_TransmitCRC( SPI1 ); 
					i++;
				}
			}
		}

		while( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_TXE ) != RESET )
		{
			if(SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_BSY ) == RESET)
			{
				SPI_Cmd( SPI1, DISABLE );
				crcval = SPI_GetCRC( SPI1, SPI_CRC_Tx );
				printf( "CRC:%02x\r\n", crcval );
				while(1);
			}
		}

#elif (SPI_MODE == SLAVE_MODE)	
		while( i<4 )
		{

			if( i<2 )
			{
				if( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_RXNE ) != RESET ) 	
				{
					RxData[i] = SPI_I2S_ReceiveData( SPI1 );	
					i++;
				}	
			}
			else if( i == 2)
			{
				SPI_TransmitCRC( SPI1 ); 
				if( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_RXNE ) != RESET )
				{
					RxData[i] = SPI_I2S_ReceiveData( SPI1 );	
					i++;
				}
			}
			else
			{
				if( SPI_I2S_GetFlagStatus( SPI1, SPI_I2S_FLAG_RXNE ) != RESET ) 	
				{
					RxData[i] = SPI_I2S_ReceiveData( SPI1 );	
					i++;
				}	
			}
		}
		
		crcval = SPI_GetCRC( SPI1, SPI_CRC_Rx );	
		printf( "CRC:%02x\r\n", crcval );
		
		for( i=0; i<4; i++ )
		{
			printf( "Rxdata:%02x\r\n", RxData[i] );
		}
		
		while(1);
		
#endif		
	}
}

